Laser-Induced Graphene Microsupercapacitors: Structure, Quality, and Performance

Abstract

Laser-induced graphene (LIG) is a graphenic material synthesized from a polymeric substrate through point-by-point laser pyrolysis. It is a fast and cost-effective technique, and it is ideal for flexible electronics and energy storage devices, such as supercapacitors. However, the miniaturization of the thicknesses of the devices, which is important for these applications, has still not been fully explored. Therefore, this work presents an optimized set of laser conditions to fabricate high-quality LIG microsupercapacitors (MSC) from 60 µm thick polyimide substrates. This is achieved by correlating their structural morphology, material quality, and electrochemical performance. The fabricated devices show a high capacitance of 22.2 mF/cm2 at 0.05 mA/cm2, as well as energy and power densities comparable to those of similar devices that are hybridized with pseudocapacitive elements. The performed structural characterization confirms that the LIG material is composed of high-quality multilayer graphene nanoflakes with good structural continuity and an optimal porosity.

Improvements in properties of polybenzoxazine-based laser-induced graphene (LIG) by alloying with polyimide and modeling of production process

“…The D peak is linked to disorders and defects in the graphene structure, while G and 2D peaks are due to carbon atom vibration because of the sp 2 hybridization in the hexagonal lattice and stacking and phonon of the graphene structure, respectively. [26][27][28][29] It could be observed that the D peak intensity in the 100%poly(Ph-dde)-LIG spectrum (Fig. 5(a)) is much more pronounced relative to the D peak intensity in the 50%poly(Ph-dde) : 50%polyimide-LIG spectrum (Fig.…”

“…4(b)).Fig.5(a) and (b) show Raman spectra of the LIG samples the three characteristics peaks, D, G, and 2D at 1350 cm −1 , 1580 cm −1 , and 2680 cm −1 , respectively are shown on the Raman spectra, which conrms the production of graphene on both the substrates. The D peak is linked to disorders and defects in the graphene structure, while G and 2D peaks are due to carbon atom vibration because of the sp 2 hybridization in the hexagonal lattice and stacking and phonon of the graphene structure, respectively [26][27][28][29]. It could be observed that the D peak…”

Comparison of Thermal and Laser-Reduced Graphene Oxide Production for Energy Storage Applications

“…When comparing the CO 2 laser-irradiated samples, the IR-LrGO-2.0 one, fabricated with the highest power, presents less SSA than the IR-LrGO-1.8 sample. Since the laser beam represents a source of highly concentrated energy, the excess in the power parameter means the structural destruction of the material [42], hence the observed reduction in SSA. When comparing the UV laser-irradiated samples, given a fixed power value, the increase in the exposure time translates into a higher reduction degree and consequently, a higher SSA.…”

Laser‐Induced Carbon Nanofiber‐Based Redox Cycling System

“…Laser‐induced carbonization by CO 2 laser has recently caught a lot of attention as an efficient and simple strategy to generate graphene electrodes on carbonizable and flexible substrates in a massive and inexpensive manner, which is highly promising for the fabrication of POC devices [21] . Recent works have successfully fabricated IDEs on polyimide (PI) sheet (or Kapton foil) via laser‐induced carbonization and demonstrated their capability as an electrochemical transducer in energy storage and sensors [22–26] . Nevertheless, to the best of our knowledge, no investigations on the redox cycling ability of the laser‐generated IDEs have been reported so far.…”

“…[21] Recent works have successfully fabricated IDEs on polyimide (PI) sheet (or Kapton foil) via laser-induced carbonization and demonstrated their capability as an electrochemical transducer in energy storage and sensors. [22][23][24][25][26] Nevertheless, to the best of our knowledge, no investigations on the redox cycling ability of the laser-generated IDEs have been reported so far. In addition, the inter-electrode distances reported were mostly in the range of a few hundred of micrometers, which may be insufficient to promote redox cycling.…”